Cannot find name ‘require’ after upgrading to Angular4

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The problem (as outlined in typescript getting error TS2304: cannot find name ‘ require’) is that the type definitions for node are not installed.

With a projected genned with @angular/cli 1.x, the specific steps should be:

Step 1:

Install @types/node with either of the following:

- npm install --save @types/node
- yarn add @types/node -D

Step 2:
Edit your src/tsconfig.app.json file and add the following in place of the empty "types": [], which should already be there:

...
"types": [ "node" ],
"typeRoots": [ "../node_modules/@types" ]
...

If I’ve missed anything, jot a comment and I’ll edit my answer.

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